Aluminum profile online quenching method and online quenching system

Abstract

The application provides an aluminum profile online quenching method and an online quenching system. The online quenching method comprises the following steps: obtaining a nose tip temperature and a quenching sensitive temperature interval and a critical cooling rate; conveying the aluminum profile to a pre-cooling quenching area, controlling a first cooling rate of the pre-cooling quenching area, reducing the aluminum profile from a first temperature to a second temperature, and making a first temperature difference between the second temperature and an upper limit temperature of the quenching sensitive temperature interval fall within a first preset temperature threshold; conveying the aluminum profile to a strong cooling quenching area, controlling a second cooling rate of the strong cooling quenching area to be greater than or equal to the critical cooling rate; and reducing the aluminum profile from the second temperature to a third temperature, and the third temperature is less than or equal to a lower limit temperature T c The application considers the characteristics of the quenching sensitive temperature interval and the critical cooling rate of the aluminum alloy, adopts different cooling rates in the pre-cooling quenching area and the strong cooling quenching area, reduces the internal residual stress of the aluminum alloy, and improves the mechanical properties of the aluminum profile.

Description

Technical Field

[0001] This invention relates to the field of aluminum profile quenching technology, and more specifically, to an online quenching method and system for aluminum profiles. Background Technology

[0002] Aluminum alloys are lightweight, corrosion-resistant, and highly malleable, making them an indispensable material in various industries, widely used in aerospace, construction, automotive, machinery manufacturing, shipbuilding, and other fields. The production process of aluminum profiles requires precise control to achieve excellent overall performance, with the quenching process being particularly crucial.

[0003] During the quenching process of aluminum profiles, temperature is a crucial factor in ensuring the production of qualified products. A quenching rate that is too slow will affect the aging strengthening effect, while a quenching rate that is too fast will lead to an increase in residual stress. Choosing an appropriate quenching rate can ensure that the aluminum alloy has high mechanical properties while effectively controlling residual stress.

[0004] In existing technologies, offline quenching and online quenching are commonly used. Offline quenching requires transporting the extruded profile to a quenching furnace, which results in high energy consumption, long production cycles, and low yield. Online quenching, on the other hand, involves quenching directly after extrusion, offering higher production efficiency compared to offline quenching. However, existing online quenching methods use a single cooling rate, leading to high residual stress within the aluminum alloy, making the aluminum profile prone to bending deformation, resulting in poor mechanical properties and a low yield. Summary of the Invention

[0005] The first aspect of this invention provides an online quenching method for aluminum profiles, which solves the technical problems of existing technologies that use a single cooling rate for quenching, resulting in high residual stress inside the aluminum alloy, easy bending deformation of the aluminum profile, poor mechanical properties of the aluminum profile, and low yield.

[0006] This invention provides an online quenching method for aluminum profiles, comprising the following steps:

[0007] S100, obtain the nose temperature T of the aluminum alloy used in the aluminum profile. b and the quenching sensitive temperature range (T c T a and critical cooling rate v b ;

[0008] S200, Perform pre-cooling quenching, including the following steps: S210, transfer the aluminum profile to the pre-cooling quenching zone, and detect the first temperature T1 before quenching and the second temperature T2 after pre-cooling quenching; S220, control the first cooling rate v1 of the pre-cooling quenching zone to reduce the temperature of the aluminum profile from the first temperature T1 before quenching to the second temperature T2 after pre-cooling quenching, and ensure that the second temperature T2 after pre-cooling quenching is close to the upper limit temperature T of the quenching sensitive temperature range. a The first temperature difference ΔT1 between them falls within the first preset temperature threshold;

[0009] S300, Perform forced quenching, including the following steps: S310, Transfer the aluminum profile to the forced quenching zone, and detect the third temperature T3 after forced quenching; S320, Control the second cooling rate v2 of the forced quenching zone to be greater than or equal to the critical cooling rate v b ; and reduce the temperature of the aluminum profile from the second temperature T2 after pre-cooling quenching to the third temperature T3 after strong cold quenching, and the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c .

[0010] Furthermore, prior to step S200, the following is included:

[0011] S101, Obtain preset extrusion process parameters and aluminum profile parameters; wherein, the preset extrusion process parameters include the cross-sectional area of ​​the extrusion cylinder and the preset extrusion shaft speed; the aluminum profile parameters include the cross-sectional area of ​​the aluminum profile, the number of die holes in the aluminum profile, and the length of the aluminum profile in the pre-cooling and quenching zone.

[0012] S102, calculate the linear velocity v of the aluminum profile. 铝 It satisfies the formula:

[0013]

[0014] Where s1 is the cross-sectional area of ​​the extrusion cylinder; v 挤 s2 is the preset extrusion shaft speed; s2 is the cross-sectional area of ​​the aluminum profile; n is the number of die holes in the aluminum profile.

[0015] Furthermore, the interval between steps S210 and S220 includes:

[0016] S211, the first target cooling rate v of the pre-cooling quenching zone is calculated. 目1 It satisfies the formula:

[0017]

[0018] ΔT0=T1-T a

[0019] Among them, v 铝 L1 is the linear velocity of the aluminum profile; L1 is the length of the aluminum profile in the pre-cooling and quenching zone; ΔT0 is the initial temperature T1 before quenching and the upper limit temperature T of the quenching-sensitive temperature range. a The first target temperature difference between them.

[0020] Further, step S220 includes the following steps:

[0021] S221, control the first cooling rate v1 of the pre-cooling quenching zone to the first target cooling rate v 目1 The aluminum profile is pre-cooled;

[0022] S222, determine whether the second temperature T2 after pre-cooling and quenching is close to the upper limit temperature T of the quenching sensitive temperature range. a The relationship between the first temperature difference ΔT1 and the first preset temperature threshold A;

[0023] S223, if the first temperature difference ΔT1 falls within the first preset temperature threshold A, then the first cooling rate v1 of the pre-cooling quenching zone is controlled to remain at the first target cooling rate v. 目1 Conversely, proceed to step S224.

[0024] S224, adjust the first cooling rate v1 to obtain the adjusted first cooling rate v1′.

[0025] Further, in step S224, the adjusted first cooling rate v1′ is calculated, satisfying the formula:

[0026]

[0027] ΔT1=T2-T a

[0028] Among them, v 目1 The first target cooling rate is α; α is a coefficient; ΔT1 is the second temperature T2 after pre-cooling and quenching and the upper limit temperature T of the quenching sensitive temperature range. a The first temperature difference between them.

[0029] Further, step S320 includes the following steps:

[0030] S321, Detecting room temperature T 室温 ;

[0031] S322, Determine the theoretical temperature T after the forced quenching. out With room temperature T 室温 and the lower limit temperature T of the quenching sensitive temperature range c Size relationship;

[0032] S323, if the theoretical temperature T after the strong cold quenching out Temperature T greater than the lower limit of the quenching sensitive temperature range c If so, then step S330 is executed, and the first control is entered;

[0033] S324, if the theoretical temperature T after the strong quenching is... out greater than room temperature T 室温 And less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c Then, step S340 is executed, and the second control is entered;

[0034] S325, if the theoretical temperature T after the strong quenching is... out Less than or equal to room temperature T 室温 Then, step S350, the third control, is executed.

[0035] Furthermore, the steps between S310 and S320 include the following:

[0036] S311, the theoretical temperature T after strong cold quenching is calculated. out It satisfies the formula:

[0037]

[0038] Where T2 is the second temperature after pre-cooling and quenching; v b L1 is the critical cooling rate; L2 is the length of the aluminum profile in the strong cold hardening zone; v 铝 This represents the linear velocity of the aluminum profile.

[0039] Furthermore, the following steps are included between steps S310 and S320:

[0040] S312, calculate the second target cooling rate v of the intense quenching zone. 目2 It satisfies the formula:

[0041]

[0042] ΔT2=T2-T c

[0043] Among them, T c This is the lower limit temperature of the quenching-sensitive temperature range; v 铝 L1 is the linear velocity of the aluminum profile; L2 is the length of the aluminum profile in the strong cold quenching zone; ΔT2 is the difference between the second temperature T2 after pre-cooling and quenching and the lower limit temperature T of the quenching sensitive temperature range. c The second target temperature difference between them.

[0044] Further, step S330, entering the first control, includes the following steps:

[0045] S331, control the second cooling rate v2 of the strong cold quenching zone to the second target cooling rate v 目2 The aluminum profile is subjected to intense cooling;

[0046] S332, determine the third temperature T3 after the strong cold quenching of the aluminum profile and the lower limit temperature T of the quenching sensitive temperature range. c The relationship between the third temperature difference ΔT3 and the third preset temperature threshold B;

[0047] S333, if the third temperature difference ΔT3 falls within the third preset temperature threshold B, then the second cooling rate v2 of the strong quenching zone is controlled to remain at the second target cooling rate v. 目2 Conversely, proceed to step S334.

[0048] S334, adjust the second cooling rate v2 to obtain the third cooling rate v3, satisfying the formula:

[0049]

[0050] ΔT3=T3-T C

[0051] Among them, v 目2 β1 is the second target cooling rate; β2 is a coefficient; ΔT3 is the third temperature T3 after strong cold quenching of the aluminum profile and the lower limit temperature T of the quenching sensitive temperature range. c The third temperature difference between them.

[0052] Further, step S340, entering the second control, includes the following steps:

[0053] S341, control the second cooling rate v2 of the strong cold quenching zone to the critical cooling rate v b The aluminum profile is subjected to intense cooling;

[0054] S342, Determine the difference between the third temperature T3 after the strong cold quenching of the aluminum profile and the theoretical temperature T after the strong cold quenching. out The relationship between the fourth temperature difference ΔT4 and the fourth preset temperature threshold C;

[0055] S343, if the fourth temperature difference ΔT4 falls within the fourth preset temperature threshold C, then the second cooling rate v2 of the strong quenching zone is controlled to remain at the critical cooling rate v. b Conversely, proceed to step S344.

[0056] S344, Adjust the second cooling rate v2 to obtain the fourth cooling rate v4, satisfying the formula:

[0057]

[0058] ΔT4=T3-T out

[0059] Among them, v b β2 is the critical cooling rate; β3 is a coefficient; ΔT4 is the third temperature T3 after strong cold quenching of the aluminum profile and the theoretical temperature T after strong cold quenching. out The fourth temperature difference between them.

[0060] Further, step S350, entering the third control, includes the following steps:

[0061] S351, Detecting inlet water temperature T 入 Actual inflow rate (m) 入 Outlet water temperature T 出 Water flow rate (m) 出 ;

[0062] S352, based on the law of conservation of energy, calculate the theoretical temperature T reached after the aforementioned strong cold quenching. out The theoretical water inflow rate (m³) through the strong cold quenching zone per unit time 理论 This includes the following steps:

[0063] S353, the theoretical heat Q that the aluminum profile needs to release per unit time in the strong cold quenching zone is calculated. Al It satisfies the formula:

[0064] Q Al =c Al *m Al *ΔT 理论

[0065] m Al =n*ρ Al *s2*v 铝

[0066] ΔT 理论 =T2-T out

[0067] S354, the theoretical water inflow rate (m) through the strong cold quenching zone per unit time was calculated. 理论 It satisfies the formula:

[0068]

[0069] m' 出 =k*m 出

[0070] Q 水 =Q Al

[0071] Among them, QAl This represents the theoretical heat (J) that an aluminum profile needs to release per unit time in the strong cold quenching zone; C Al C is the specific heat capacity of aluminum profiles. Al =0.88*10 3 J / (kg*℃); m Al ΔT represents the mass (kg) of aluminum profile passing through the intense cooling zone per unit time. 理论 The second temperature T2 after pre-cooling quenching and the theoretical temperature T after strong cold quenching are... out The theoretical temperature difference between them (°C); s2 is the cross-sectional area of ​​the aluminum profile (m²). 3 ); n is the number of die holes in the aluminum profile; v 铝 ρ is the linear velocity of the aluminum profile (m / s); Al ρ is the density of the aluminum profile. Al =2.50*10 3 kg / m 3 -2.88*10 3 kg / m 3 Between; C 水 C is the specific heat capacity of water. 水 =4.2×10 3 J / (kg*℃); T 入 Inlet water temperature (°C); m 入 T represents the actual inflow rate. 出 The outlet water temperature T 出 m 出 is the outflow rate; k is the compensation coefficient, k = 1.05 - 1.3;

[0072] S355, control the strong cold quenching zone to have the theoretical water inlet flow rate m 理论 The pre-cooled aluminum profile is subjected to intensive cooling.

[0073] A second aspect of the present invention provides an online quenching system for aluminum profiles, employing the online quenching method for aluminum profiles described in any of the preceding claims, wherein the online quenching system comprises:

[0074] The detection module includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is used to detect the first temperature T1 before quenching; the second temperature sensor is used to detect the second temperature T2 after pre-cooling quenching; and the third temperature sensor is used to detect the third temperature T3 after strong cold quenching.

[0075] The control module is used to control the first cooling rate v1 of the pre-cooling and quenching zone, so that the temperature of the aluminum profile decreases from the first temperature T1 before quenching to the second temperature T2 after pre-cooling and quenching, and the second temperature T2 after pre-cooling and quenching is close to the upper limit temperature T of the quenching sensitive temperature range.a The first temperature difference ΔT1 between the two falls within the first preset temperature threshold; and the second cooling rate v2 used to control the strong quenching zone is greater than or equal to the critical cooling rate v b ; and reduce the temperature of the aluminum profile from the second temperature T2 after pre-cooling quenching to the third temperature T3 after strong cold quenching, and the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c .

[0076] The online quenching method for aluminum profiles provided by this invention has the following beneficial technical effects:

[0077] (1) The present invention provides an online quenching method for aluminum profiles, which takes into account the quenching sensitive temperature range of aluminum alloys and the characteristics of the non-precipitation critical cooling rate of β″ and β′ phases. A staged quenching process is adopted, and different cooling rates are adopted in the pre-cooling quenching zone and the strong cooling quenching zone to control the second temperature T2 after pre-cooling quenching to reach the upper limit temperature T of the quenching sensitive temperature range. a And control the third temperature T3 after strong cold quenching to be less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c This reduces residual stress inside the aluminum alloy and prevents the decomposition of the solid solution, thereby improving the mechanical properties of the aluminum profile after aging. In addition, compared with the offline quenching method, the aluminum profile has a higher yield and higher production efficiency.

[0078] (2) The present invention provides an online quenching method for aluminum profiles, which calculates the critical cooling rate v. b Below, the theoretical temperature T after strong cold quenching out This ensures that the second cooling rate v2 of the strong cold quenching is greater than the critical cooling rate v. b ;

[0079] (3) The present invention provides an online quenching method for aluminum profiles, which compares the theoretical temperature T after strong cold quenching. out With room temperature T 室温 and the lower limit temperature T of the quenching sensitive temperature range c The magnitude of the temperature varies, and different controls are applied to ensure that the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching-sensitive temperature range. c ;

[0080] (4) The present invention provides an online quenching method for aluminum profiles, wherein the theoretical temperature T after strong cold quenching is... out When room temperature is reached, but the second cooling rate is less than the critical cooling rate, the cooling rate cannot be adjusted using the first and second control methods. It is necessary to accurately calculate the theoretical temperature T after the intense quenching based on the law of conservation of energy. out The theoretical water inflow rate (m³) through the strong cold quenching zone per unit time理论 Thus, the second cooling rate v2 is greater than or equal to the critical cooling rate v b Requirements. Attached Figure Description

[0081] Figure 1(a) is a schematic diagram of the time-temperature-performance curve (TTT curve) of aluminum alloy 6005 in the prior art;

[0082] Figure 1(b) is a schematic diagram of the continuous cooling transformation curve (CCT curve) of aluminum alloy 6005 in the prior art;

[0083] Figure 2 This is a first flowchart of an online quenching method for aluminum profiles provided in an embodiment of the present invention;

[0084] Figure 3 A flowchart of pre-cooling quenching in an online quenching method for aluminum profiles is provided in an embodiment of the present invention;

[0085] Figure 4 A flowchart of the strong cold quenching process in an online quenching method for aluminum profiles provided in this embodiment of the invention;

[0086] Figure 5 This is a first control flowchart of a strong cold quenching process in an online quenching method for aluminum profiles provided in an embodiment of the present invention;

[0087] Figure 6 This is a second control flowchart for the strong cold quenching process in an online quenching method for aluminum profiles provided in an embodiment of the present invention;

[0088] Figure 7 This is a third control flowchart of the strong cold quenching process in an online quenching method for aluminum profiles provided in an embodiment of the present invention;

[0089] Figure 8 This is an isometric schematic diagram of an online quenching device for aluminum profiles provided in an embodiment of the present invention;

[0090] Figure 9 for Figure 8 The middle circle shows a magnified view of part B;

[0091] Figure 10 for Figure 9 The middle circle shows a magnified view of part C.

[0092] Figure 11 This is a front view schematic diagram of an online quenching device for aluminum profiles provided in an embodiment of the present invention;

[0093] Figure 12 for Figure 11 A schematic diagram of the AA cross-sectional structure;

[0094] Figure 13for Figure 12 The middle circle shows a magnified view of part D. Detailed Implementation

[0095] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to Figures 1-7.

[0096] This invention provides an online quenching method for aluminum profiles, see attached figure. Figure 2 The online quenching method for aluminum profiles includes the following steps:

[0097] S100, obtain the nose temperature T of the aluminum alloy used in the aluminum profile. b and the quenching sensitive temperature range (T c T a and critical cooling rate v b ;

[0098] It should be noted that online quenching combines the extrusion process, solution treatment, and quenching, making full use of the residual heat generated by extrusion. Quenching can be performed directly after extrusion, which can simplify the process, save energy, improve efficiency, shorten the production cycle, and reduce costs, resulting in significant economic benefits.

[0099] Different aluminum alloys have different quenching sensitivities. Quenching sensitivity refers to the stability of the supersaturated solid solution in aluminum alloys during quenching and the ease with which it precipitates out. It is used to characterize the sensitivity of heat-treatable aluminum alloys to the quenching cooling rate during the decomposition process of the supersaturated solid solution during solution quenching.

[0100] In this embodiment of the invention, the nose tip temperature T of the aluminum alloy can be obtained based on the time-temperature-performance curve (TTP curve) or the time-temperature-transformation curve (TTT curve). b and the quenching sensitive temperature range (T c T a The critical cooling rate v is obtained based on the continuous cooling transition curve (CCT curve) or quenching factor analysis method. b .

[0101] Referring to Figure 1(a), in this embodiment of the invention, the aluminum alloy is made of 6005. The TTT curve shows that for this aluminum alloy at the nose tip temperature T... b The incubation period is the shortest, the supersaturated solid solution is the least stable, the precipitation rate is the fastest, and the alloy has the highest quenching sensitivity. The incubation period in the high-temperature and low-temperature regions is relatively long, while the quenching sensitivity of aluminum alloys is relatively low. As shown in the figure, the nose temperature T of 6005 aluminum alloy... b For 340℃ and the quenching sensitive temperature range (T c T a(280℃, 415℃).

[0102] The precipitation process of 6005 aluminum alloy during heat treatment and aging is as follows: solid solution → supersaturated solute atomic clusters → GP zone → needle-like β″ phase → β′ phase → β phase (Mg2Si); among which the most important strengthening phase is the β″ phase. Referring to Figure 1(b), the CCT curve shows the critical cooling rate vc for the β″ and β′ phases to prevent precipitation. b It is 9℃ / s.

[0103] S200, perform pre-cooling quenching, including the following steps:

[0104] S210, convey the aluminum profile to the pre-cooling and quenching zone, and detect the first temperature T1 before quenching and the second temperature T2 after pre-cooling and quenching.

[0105] S220 controls the first cooling rate v1 of the pre-cooling quenching zone, causing the temperature of the aluminum profile to decrease from the first temperature T1 before quenching to the second temperature T2 after pre-cooling quenching, and ensuring that the second temperature T2 after pre-cooling quenching is close to the upper limit temperature T of the quenching sensitive temperature range. a The first temperature difference ΔT1 between them falls within the first preset temperature threshold A;

[0106] It should be noted that the second temperature T2 after pre-cooling and quenching is close to the upper limit temperature T of the quenching sensitive temperature range. a The first temperature difference ΔT1 between the two values ​​falls within the first preset temperature threshold A, indicating that the second temperature T2 after pre-cooling and quenching reaches the upper limit of the quenching sensitive temperature range. a .

[0107] It should be noted that the first cooling rate v1 in the pre-cooling quenching zone is less than the critical cooling rate v. b .

[0108] It should be noted that before entering the pre-cooling and quenching zone, the initial temperature T1 before quenching is greater than the upper limit temperature T of the quenching sensitive temperature range. a The aluminum profile is in a high-temperature zone and is pre-cooled using a first cooling rate v1, which is less than the critical cooling rate v. b This reduces quenching stress and improves the performance of aluminum profiles.

[0109] It should be noted that the first preset temperature threshold A has a range of (-5℃, +5℃).

[0110] S300, perform strong cold hardening, including the following steps:

[0111] S310: Transfer the aluminum profile to the forced quenching zone and detect the third temperature T3 after forced quenching; S320: Control the second cooling rate v2 of the forced quenching zone to be greater than or equal to the critical cooling rate vb ; and reduce the temperature of the aluminum profile from the second temperature T2 after pre-cooling quenching to the third temperature T3 after strong cold quenching, and the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c .

[0112] It should be noted that the second temperature T2 after pre-cooling and quenching reaches the upper limit T of the quenching sensitive temperature range. a Enter the strong cold quenching zone, perform strong cold quenching, and control the second cooling rate v2 of the strong cold quenching zone to be greater than or equal to the critical cooling rate v. b It quickly passes through the strong cold quenching zone, and the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c This reduces quenching stress, prevents solid solution dissolution, and improves the mechanical properties of aluminum profiles.

[0113] Therefore, the online quenching method for aluminum alloys provided in this embodiment of the invention considers the quenching-sensitive temperature range of aluminum alloys and the characteristics of the non-precipitation critical cooling rate of β″ and β′ phases. It employs a staged quenching process, using different cooling rates in the pre-cooling quenching zone and the strong cooling quenching zone, and controlling the second temperature T2 after pre-cooling quenching to reach the upper limit temperature T of the quenching-sensitive temperature range. a And control the third temperature T3 after strong cold quenching to be less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c This reduces residual stress inside the aluminum alloy and prevents the decomposition of the solid solution, thereby improving the mechanical properties of the aluminum profile after aging. In addition, compared with the offline quenching method, the yield of aluminum profiles is higher and the production efficiency is higher.

[0114] In this embodiment of the invention, the pre-cooling and quenching zone is cooled by air and / or water mist.

[0115] In this embodiment of the invention, the strong cold quenching zone is cooled by immersion in water.

[0116] In this embodiment of the invention, the steps preceding step S200 include:

[0117] S101, obtain the preset extrusion process parameters and aluminum profile parameters; wherein, the preset extrusion process parameters include the cross-sectional area of ​​the extrusion cylinder and the preset extrusion shaft speed; the aluminum profile parameters include the cross-sectional area of ​​the aluminum profile, the number of die holes of the aluminum profile, and the length of the aluminum profile in the pre-cooling and quenching zone.

[0118] S102, the linear velocity v of the aluminum profile is calculated. 铝 It satisfies the formula:

[0119]

[0120] Where s1 is the cross-sectional area of ​​the extrusion cylinder; v 挤s2 is the preset extrusion shaft speed; s2 is the cross-sectional area of ​​the aluminum profile; n is the number of die holes in the aluminum profile.

[0121] This invention provides an online quenching method for aluminum profiles, based on the cross-sectional area s1 of the extrusion cylinder and the preset extrusion shaft speed v. 挤 Given the cross-sectional area s2 of the aluminum profile and the number of die holes n, determine the linear velocity v of the aluminum profile. 铝 .

[0122] In this embodiment of the invention, the interval between steps S210 and S220 includes:

[0123] S211, the first target cooling rate v of the pre-cooling quenching zone is calculated. 目1 It satisfies the formula:

[0124]

[0125] ΔT0=T1-T a

[0126] Among them, v 铝 L1 is the linear velocity of the aluminum profile; L1 is the length of the aluminum profile in the pre-cooling and quenching zone; ΔT0 is the initial temperature T1 before quenching and the upper limit temperature T of the quenching-sensitive temperature range. a The first target temperature difference between them.

[0127] This invention provides an online quenching method for aluminum profiles, based on the linear velocity v of the aluminum profile. 铝 The initial temperature T1 before quenching and the upper limit temperature T of the quenching sensitive temperature range. a The first target cooling rate v is determined by the first target temperature difference ΔT0 between the two temperatures and the length L1 of the aluminum profile in the pre-cooling and quenching zone. 目1 .

[0128] See appendix Figure 3 In this embodiment of the invention, step S220 includes the following steps:

[0129] S221, control the first cooling rate v1 of the pre-cooling quenching zone to a first target cooling rate v 目1 Pre-cool the aluminum profile;

[0130] S222, Determine the relationship between the second temperature T2 after pre-cooling and quenching and the upper limit temperature T of the quenching sensitive temperature range. a The relationship between the first temperature difference ΔT1 and the first preset temperature threshold A;

[0131] S223, if the first temperature difference ΔT1 falls within the first preset temperature threshold A, then the first cooling rate v1 of the pre-cooling quenching zone is controlled to remain at the first target cooling rate v. 目1Conversely, proceed to step S224.

[0132] S224, adjust the first cooling rate v1 to obtain the adjusted first cooling rate v1′.

[0133] It should be noted that the first cooling rate v1 is adjusted to obtain the adjusted first cooling rate v1′. The first cooling rate v1 of the pre-cooling quenching zone is controlled to pre-cool the aluminum profile with the adjusted first cooling rate v1′. Step S222 is then executed until the first temperature difference ΔT1 falls within the first preset temperature threshold A.

[0134] In this embodiment of the invention, step S224 involves calculating the adjusted first cooling rate v1′, which satisfies the formula:

[0135]

[0136] ΔT1=T2-T a

[0137] Among them, v 目1 The first target cooling rate is α; α is a coefficient; ΔT1 is the second temperature T2 after pre-cooling and quenching and the upper limit temperature T of the quenching sensitive temperature range. a The first temperature difference between them.

[0138] It should be noted that α can be set based on the actual situation. In one implementation, α = 0.005-0.015.

[0139] It should be noted that if the second temperature T2 after pre-cooling and quenching is greater than the upper limit temperature T of the quenching sensitive temperature range... a Then, by using the above formula, the first cooling rate can be appropriately increased; if the second temperature T2 after pre-cooling and quenching is less than the upper limit temperature T of the quenching sensitive temperature range. a Then, by using the above formula, the first cooling rate is appropriately reduced until the first temperature difference ΔT1 falls within the first preset temperature threshold A.

[0140] This invention provides a method for quenching aluminum profiles, which compares a second temperature T2 after pre-cooling quenching with the upper limit temperature T of the quenching-sensitive temperature range. a The relationship between the magnitudes is used to control and adjust the first cooling rate v1, thereby achieving precise control over the first cooling rate v1 in the pre-cooling and quenching zone, as well as precise control over the second temperature T2 after pre-cooling and quenching. This ensures that the temperature of the aluminum profile before entering the strong quenching zone reaches the upper limit temperature T of the quenching-sensitive temperature range. a .

[0141] In this embodiment of the invention, the steps between S310 and S320 include the following steps:

[0142] S311, the theoretical temperature T after strong cold quenching is calculated. out It satisfies the formula:

[0143]

[0144] Where T2 is the second temperature after pre-cooling and quenching; v b L1 is the critical cooling rate; L2 is the length of the aluminum profile in the strong cold hardening zone; v 铝 This represents the linear velocity of the aluminum profile.

[0145] It should be noted that in this formula, the second temperature T2 after pre-cooling and quenching satisfies the following condition: the second temperature T2 after pre-cooling and quenching is close to the upper limit temperature T of the quenching sensitive temperature range. a It falls within the first preset temperature threshold A.

[0146] It should be noted that the length L2 of the aluminum profile in the strong cold quenching zone is less than the length L1 of the aluminum profile in the pre-cold quenching zone.

[0147] In this embodiment of the invention, the length L1 of the aluminum profile in the pre-cooling and quenching zone is between 1m and 1.5m; the length L2 of the aluminum profile in the strong cold quenching zone is between 0.65m and 1m.

[0148] It should be noted that, due to the preset extrusion shaft speed v 挤 The linear velocity v of aluminum profiles is different. 铝 They will be different. Under the premise that the length L2 of the aluminum profile in the strong cold quenching zone is the same, (1) if the linear velocity v of the aluminum profile... 铝 The large temperature range causes the aluminum profile to pass through the rapid cooling zone quickly, resulting in a short cooling time. Therefore, the second cooling rate v2 is greater than the critical cooling rate v. b The third temperature T3 after strong cold quenching is greater than the lower limit temperature T of the quenching sensitive temperature range. c There exists a situation where the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c Requirements; (2) If the linear velocity v of the aluminum profile 铝 The small temperature range causes the aluminum profile to pass slowly through the forced cooling zone, resulting in a long cooling time. Consequently, the third temperature T3 after forced cooling is lower than the lower limit temperature T of the quenching-sensitive temperature range. c And it is greater than room temperature, the second cooling rate v2 is less than the critical cooling rate v b There exists a situation where the second cooling rate v2 is not greater than the critical cooling rate v. b Requirements; (3) If the linear velocity v of the aluminum profile 铝 The small temperature range causes the aluminum profile to pass slowly through the forced cooling zone, resulting in a long cooling time. The third temperature T3 after forced cooling reaches room temperature, and the second cooling rate v2 is less than the critical cooling rate v. bThere exists a situation where the second cooling rate v2 is not greater than the critical cooling rate v. b Therefore, it is necessary to calculate the critical cooling rate v. b Below, the theoretical temperature T after strong cold quenching out This ensures that the second cooling rate v2 of the strong cold quenching is greater than the critical cooling rate v. b .

[0149] See appendix Figure 4 In this embodiment of the invention, step S320 includes the following steps:

[0150] S321, Detecting room temperature T 室温 ;

[0151] S322, Determine the theoretical temperature T after strong cold quenching. out With room temperature T 室温 and the lower limit temperature T of the quenching sensitive temperature range c Size relationship;

[0152] S323, if the theoretical temperature T after strong cold quenching out Temperature T greater than the lower limit of the quenching sensitive temperature range c If so, then step S330 is executed, and the first control is entered;

[0153] S324, if the theoretical temperature T after strong cold quenching out greater than room temperature T 室温 And less than or equal to the lower limit temperature T of the quenching sensitive temperature range c Then, step S340 is executed, and the second control is entered;

[0154] S325, if the theoretical temperature T after strong cold quenching out Less than or equal to room temperature T 室温 Then, step S350, the third control, is executed.

[0155] This invention provides an online quenching method for aluminum profiles, which compares the theoretical temperature T after strong cold quenching. out With room temperature T 室温 and the lower limit temperature T of the quenching sensitive temperature range c The magnitude of the temperature varies, and different controls are applied to ensure that the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching-sensitive temperature range. c .

[0156] In this embodiment of the invention, the step between steps S310 and S320 further includes the following step:

[0157] S312, the second target cooling rate v of the strong quenching zone is calculated. 目2 It satisfies the formula:

[0158]

[0159] ΔT2=T2-T c

[0160] Among them, T c This is the lower limit temperature of the quenching-sensitive temperature range; v 铝 L1 is the linear velocity of the aluminum profile; L2 is the length of the aluminum profile in the strong cold quenching zone; ΔT2 is the difference between the second temperature T2 after pre-cooling and quenching and the lower limit temperature T of the quenching sensitive temperature range. c The second target temperature difference between them.

[0161] It should be noted that the second target temperature difference ΔT2 is greater than the first temperature difference ΔT1.

[0162] It should be noted that v 目2 greater than the critical cooling rate v b .

[0163] This invention provides an online quenching method for aluminum profiles, based on the linear velocity v of the aluminum profile. 铝 The first temperature T2 after quenching and the lower limit temperature T of the quenching sensitive temperature range. c The second target cooling rate v is determined by the second target temperature difference ΔT2 and the length L2 of the aluminum profile in the strong quenching zone. 目2 .

[0164] See appendix Figure 5 In this embodiment of the invention, step S330, entering the first control, includes the following steps:

[0165] S331, control the second cooling rate v2 of the strong cold quenching zone to achieve the second target cooling rate v 目2 Strong cooling of aluminum profiles;

[0166] S332, Determine the relationship between the third temperature T3 after strong cold quenching of aluminum profiles and the lower limit temperature T of the quenching sensitive temperature range. c The relationship between the third temperature difference ΔT3 and the third preset temperature threshold B;

[0167] S333, if the third temperature difference ΔT3 falls within the third preset temperature threshold B, then the second cooling rate v2 of the strong cold quenching zone is maintained at the second target cooling rate v. 目2 Conversely, proceed to step S334.

[0168] S334, adjust the second cooling rate v2 to obtain the third cooling rate v3, satisfying the formula:

[0169]

[0170] ΔT3=T3-TC

[0171] Among them, v 目2 The second target cooling rate; β1 is a coefficient, β = 0.005-0.015; ΔT3 is the third temperature T3 after strong cold quenching of the aluminum profile and the lower limit temperature T of the quenching sensitive temperature range. c The third temperature difference between them.

[0172] It should be noted that β1 can be set based on actual conditions. In one implementation, β1 = 0.005-0.015.

[0173] In this embodiment of the invention, the third preset temperature threshold B has a range of (-5℃, 0℃).

[0174] See appendix Figure 6 In this embodiment of the invention, step S340, entering the second control, includes the following steps:

[0175] S341, control the second cooling rate v2 of the strong cold quenching zone to the critical cooling rate v b Strong cooling of aluminum profiles;

[0176] S342, Determine the difference between the third temperature T3 after strong cold quenching of aluminum profiles and the theoretical temperature T after strong cold quenching. out The relationship between the fourth temperature difference ΔT4 and the fourth preset temperature threshold C;

[0177] S343, If the fourth temperature difference ΔT4 falls within the fourth preset temperature threshold C, then the second cooling rate v2 of the strong quenching zone is maintained at the critical cooling rate v. b Conversely, proceed to step S344.

[0178] S344, adjust the second cooling rate v2 to obtain the fourth cooling rate v4, which satisfies the formula:

[0179]

[0180] ΔT4=T3-T out

[0181] Among them, v b β2 is the critical cooling rate; β3 is a coefficient; ΔT4 is the third temperature T3 after strong cold quenching of the aluminum profile and the theoretical temperature T after strong cold quenching. out The fourth temperature difference between them.

[0182] It should be noted that β2 can be set based on actual conditions. In one implementation, β2 = 0.005-0.015.

[0183] In this embodiment of the invention, the fourth preset temperature threshold C has a value range of (-5℃, 5℃).

[0184] See appendix Figure 7 In this embodiment of the invention, step S350, entering the third control, includes the following steps:

[0185] S351, Detecting inlet water temperature T 入 Actual inflow rate (m) 入 Outlet water temperature T 出 Water flow rate (m) 出 ;

[0186] S352, based on the law of conservation of energy, calculates the theoretical temperature T after strong cold quenching. out The theoretical water inflow rate (m³) through the strong cold quenching zone per unit time 理论 This includes the following steps:

[0187] S353, the theoretical heat Q that the aluminum profile needs to release per unit time in the strong cold quenching zone is calculated. Al It satisfies the formula:

[0188] Q Al =c Al *m Al *ΔT 理论

[0189] m Al =n*ρ Al *s2*v 铝

[0190] ΔT 理论 =T2-T out

[0191] S354, the theoretical water inflow rate (m) through the strong cold quenching zone per unit time was calculated. 理论 It satisfies the formula:

[0192]

[0193] m' 出 =k*m 出

[0194] Q 水 =Q Al

[0195] Among them, Q Al This represents the theoretical heat (J) that an aluminum profile needs to release per unit time in the strong cold quenching zone; C Al C is the specific heat capacity of aluminum profiles. Al =0.88*10 3 J / (kg*℃); m AlΔT represents the mass (kg) of aluminum profile passing through the intense cooling zone per unit time. 理论 The second temperature T2 after pre-cooling quenching and the theoretical temperature T after strong cold quenching are... out The theoretical temperature difference between them (°C); s2 is the cross-sectional area of ​​the aluminum profile (m3); n is the number of die holes in the aluminum profile; v 铝 ρ is the linear velocity of the aluminum profile (m / s); Al ρ is the density of the aluminum profile. Al =2.50*10 3 kg / m3-2.88*10 3 Between kg / m3; C 水 C is the specific heat capacity of water. 水 =4.2×10 3 J / (kg*℃); T 入 Inlet water temperature (°C); m 入 T represents the actual inflow rate. 出 The outlet water temperature T 出 m 出 is the outflow rate; k is the compensation coefficient, k = 1.05 - 1.3;

[0196] It should be noted that since some cooling water adheres to the aluminum profile, a compensation coefficient k is introduced.

[0197] S355, controls the strong cold quenching zone with a theoretical water inlet flow rate (m). 理论 The pre-cooled aluminum profiles are subjected to intensive cooling.

[0198] This invention provides an online quenching method for aluminum profiles, wherein the theoretical temperature T after strong cold quenching is... out When room temperature is reached, but the second cooling rate is less than the critical cooling rate, the cooling rate cannot be adjusted using the first and second control methods. It is necessary to accurately calculate the theoretical temperature T after strong cold quenching based on the law of conservation of energy. out The theoretical water inflow rate (m³) through the strong cold quenching zone per unit time 理论 Thus, the second cooling rate v2 is greater than or equal to the critical cooling rate v b Requirements.

[0199] A second aspect of the present invention provides an online quenching system for aluminum profiles, employing any of the above-described online quenching methods for aluminum profiles, the online quenching system comprising:

[0200] The detection module includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is used to detect the first temperature T1 before quenching; the second temperature sensor is used to detect the second temperature T2 after pre-cooling quenching; and the third temperature sensor is used to detect the third temperature T3 after strong cold quenching.

[0201] The control module controls the first cooling rate v1 of the pre-cooling and quenching zone, reducing the temperature of the aluminum profile from the first temperature T1 before quenching to the second temperature T2 after pre-cooling and quenching, and ensuring that the second temperature T2 after pre-cooling and quenching is close to the upper limit temperature T of the quenching-sensitive temperature range. a The first temperature difference ΔT1 between the two falls within the first preset temperature threshold; and the second cooling rate v2 used to control the strong quenching zone is greater than or equal to the critical cooling rate v b ; and reduce the temperature of the aluminum profile from the second temperature T2 after pre-cooling quenching to the third temperature T3 after strong cold quenching, and the third temperature T3 after strong cold quenching is less than or equal to the lower limit temperature T of the quenching sensitive temperature range. c .

[0202] This invention provides an online quenching device for aluminum profiles, see attached document. Figure 8 - Figure 10 The online quenching device for aluminum profiles includes a conveying assembly 20, a first cooling assembly 30, and a second cooling assembly 40. The conveying assembly 20 is used to convey the aluminum profile 10 extruded by an extruder along a first direction. The first cooling assembly 30 includes a first cooling tank 310 and a first cover 320, with the first cover 320 covering the top of the first cooling tank 310. At least one of the bottom of the first cooling tank 310 and the first cover 320 is provided with a water mist cooling nozzle 330 and / or an air-cooling nozzle 340 for pre-cooling and quenching the aluminum profile 10. The second cooling assembly 40... The second cooling component 40 is arranged adjacent to the first cooling component 30 along the first direction and is located downstream of the first cooling component 30; the second cooling component 40 includes a second cooling box 410 and a second cover 420. The second cooling box 410 is used to perform water immersion quenching on the aluminum profile 10; the second cooling box 410 has openings 414 at both ends along the first direction for the aluminum profile 10 to pass through; the second cover 420 covers the top of the second cooling box 410 and has a water inlet; wherein, the first direction refers to the conveying direction of the aluminum profile 10.

[0203] It should be noted that the cross-sectional shape and dimensions of the opening 414 are consistent with the cross-sectional shape and dimensions of the profile.

[0204] It should be noted that the cooling rate of water mist cooling and air cooling is lower than that of immersion cooling.

[0205] It should be noted that online quenching combines the extrusion process, solution treatment, and quenching, making full use of the residual heat generated by extrusion. Quenching can be performed directly after extrusion, which can simplify the process, save energy, improve efficiency, shorten the production cycle, and reduce costs, resulting in significant economic benefits.

[0206] Different aluminum alloys have different quenching sensitivities. Quenching sensitivity refers to the stability of the supersaturated solid solution in aluminum alloys during quenching and the ease with which it precipitates out. It is used to characterize the sensitivity of heat-treatable aluminum alloys to the quenching cooling rate during the decomposition process of the supersaturated solid solution during solution quenching.

[0207] It should be noted that the time-temperature-performance (TTP) curve is C-shaped. For the same alloy, the incubation period is shortest at the nose temperature, the supersaturated solid solution is least stable, the precipitation rate is fastest, and the aluminum alloy has the highest quenching sensitivity. Above or below the quenching sensitivity temperature range, the incubation period is longer, and the quenching sensitivity of the aluminum alloy is lower. In the online quenching process of aluminum profile 10, in order to minimize residual stress, the aluminum alloy should be slowly cooled to the upper limit of the quenching sensitivity temperature range of the TTP curve, and then quickly passed through the quenching sensitivity temperature range at a certain cooling rate. As long as the cooling time is less than the time required for the supersaturated solid solution to precipitate, the adverse effects on the alloy properties can be minimized.

[0208] In this embodiment of the invention, the temperature of the extruded aluminum profile 10 is higher than the upper limit temperature of the quenching sensitive temperature range corresponding to the aluminum profile 10. It is then transported to the first quenching assembly for water mist cooling and / or air cooling to slowly cool the temperature of the aluminum profile 10 to the upper limit temperature of the quenching sensitive temperature range of the aluminum alloy. Then it is transported to the second quenching assembly for immersion cooling to rapidly cool the temperature of the aluminum profile 10 to below the lower limit temperature of the quenching sensitive temperature range of the aluminum alloy.

[0209] Therefore, the online quenching device for aluminum profiles provided in this embodiment of the invention first performs water mist cooling and / or air cooling on the aluminum profile 10 to achieve slow cooling of the aluminum profile 10 above the quenching sensitive temperature range; then, the aluminum profile 10 is immersed in water for rapid cooling within the quenching sensitive range, preventing the rapid decomposition of supersaturated solid solutions; effectively controlling residual stress while improving the mechanical properties of the aluminum profile 10; in addition, compared with offline quenching, it makes full use of the residual heat generated by extrusion and performs quenching directly after extrusion, simplifying the process, saving energy, improving efficiency, shortening the production cycle, and reducing costs, which has significant economic benefits.

[0210] See appendix Figure 8 In this embodiment of the invention, the second cooling assembly 40 further includes a water collection tank 430, which is located outside the second cooling tank 410. A gap exists between the sidewalls of the water collection tank 430 and the second cooling tank 410 along the first direction. The water collection tank 430 is provided with a first water outlet. The second cooling tank 410 is provided with a second water outlet, which is connected to the water collection tank 430.

[0211] It should be noted that, since the second cooling box 410 has openings 414 at both ends along the first direction for passing through the aluminum profile 10, some cooling water will leak from the openings 414, affecting the detection of cooling water flow.

[0212] Therefore, the online quenching device for aluminum profiles provided in this embodiment of the invention facilitates the collection of cooling water flowing out through the second outlet and opening 414 of the second cooling box 410 by providing a water collection tank 430 on the outside of the second cooling box 410.

[0213] See appendix Figure 10 In this embodiment of the invention, the second cooling box 410 has notches 411 at both ends along the first direction, the notches 411 are provided with baffles 413, and openings 414 are provided on the baffles 413.

[0214] It should be noted that the opening 414 on the baffle 413 can be designed based on the actual cross-sectional shape or actual cross-sectional size of the profile, and the baffle 413 is detachably connected to the notch 411.

[0215] The present invention provides an online quenching device for aluminum profiles. By setting the opening 414 on the baffle 413, it is applicable to profiles with different cross-sectional shapes or different cross-sectional dimensions. If the aluminum profiles 10 to be quenched online are different, only the corresponding baffle 413 needs to be replaced, thereby improving the practicality of the second cooling box 410.

[0216] See appendix Figure 10 In this embodiment of the invention, the inner wall of the notch 411 is provided with a groove 412, the grooves 412 are arranged opposite each other along a second direction, and the baffle 413 is engaged in the groove 412; wherein, the second direction is perpendicular to the first direction. This arrangement facilitates disassembly and installation.

[0217] See appendix Figure 9 and Figure 13 In this embodiment of the invention, the online quenching device further includes a first temperature sensor 214, a second temperature sensor 215, and a third temperature sensor 216. The first temperature sensor 214 and the second temperature sensor 215 are respectively located at both ends of the first cooling tank 310 along a first direction; the third temperature sensor 216 is located at the end of the second cooling tank 410 away from the first cooling tank 310. The first temperature sensor 214 is used to detect the first temperature of the aluminum profile 10 before quenching, the second temperature sensor 215 is used to detect the second temperature of the aluminum profile 10 after pre-cooling quenching, and the third temperature sensor 216 is used to detect the third temperature of the aluminum profile 10 after forced cold quenching. This configuration facilitates real-time detection of the temperature of the aluminum profile 10 before and after pre-cooling quenching and after forced cold quenching, and allows for adjustment of the cooling rate or cooling intensity based on the actual temperature, achieving precise control of the cooling rate or cooling intensity of the aluminum profile 10, reducing deformation of the aluminum alloy, and improving the mechanical strength and performance of the aluminum profile 10.

[0218] In this embodiment of the invention, the online quenching device also includes a control system, and the first temperature sensor 214, the second temperature sensor 215 and the third temperature sensor 216 are all electrically connected to the control system.

[0219] Participate in the attached Figure 8 and Figure 13 In this embodiment of the invention, the conveying assembly 20 includes a support frame 210 and idlers 220. The idlers 220 are pivotally connected to the support frame 210. Multiple idlers 220 are spaced apart along a first direction and are used to support the aluminum profile 10. This arrangement supports the aluminum profile 10 and prevents it from bending or deforming.

[0220] See appendix Figure 13 In one embodiment of the present invention, the support frame 210 passes through the first cooling tank 310 and the water collection tank 430, and part of the support frame 210 is located between the side walls of the water collection tank 430 and the second cooling tank 410.

[0221] In this embodiment of the invention, the first cooling tank 310 and the water collection tank 430 are adjacent to each other, and a partition 415 is provided between them. The partition 415 is provided with a clearance groove for the passage of the support frame 210.

[0222] See appendix Figure 10 In one embodiment of the present invention, the partition 415 is convex in shape and includes a first section, a middle section and a second section connected in sequence. The first section and the second section are used to support the bearing frame 210; the middle section is used to support the aluminum profile 10.

[0223] In this embodiment of the invention, the clearance groove is located in the first section.

[0224] In a second embodiment of the present invention, the conveying assembly 20 has at least two sets, respectively located between the front end of the extruder and the side wall of the water collection tank 430 near the first cooling tank 310, and downstream of the side wall of the water collection tank 430 away from the first cooling tank 310 along the first direction.

[0225] In a third embodiment of the present invention, the conveying assembly 20 has three sets, which are respectively located between the front end of the extruder and the side wall of the water collection tank 430 near the first cooling tank 310, downstream of the side wall of the water collection tank 430 away from the first cooling tank 310 along the first direction, and in the second cooling tank 410.

[0226] See appendix Figure 8 In this embodiment of the invention, the support frame 210 is fixedly provided with a first support 211, a second support 212 and a third support 213, a first temperature sensor 214 is fixedly provided with the first support 211, a second temperature sensor 215 is fixedly provided with the second support 212 and a third temperature sensor 216 is fixedly provided with the third support 213.

[0227] In this embodiment of the invention, an inlet is connected to an inlet pipe, which connects to a water storage tank. The inlet pipe is equipped with a first flow meter and a first thermometer. The first flow meter detects the inlet water flow rate, and the first thermometer detects the inlet water temperature. A first outlet is connected to an outlet pipe, which is equipped with a second flow meter and a second thermometer. The second flow meter detects the outlet water flow rate, and the second thermometer detects the outlet water temperature. This configuration, based on the law of conservation of energy, controls the inlet water flow rate per unit time to provide strong cooling to the pre-cooled aluminum profile 10.

[0228] In this embodiment of the invention, the water inlet pipe is equipped with a flow control valve, which is electrically connected to the control system and is used to adjust the water inlet flow rate, thereby adjusting the water cooling intensity.

[0229] See appendix Figure 9 and Figure 13 In this embodiment of the invention, a stirrer 416 is provided inside the second cooling tank 410. The stirrer 416 is used to homogenize the temperature of the cooling water in the second cooling tank 410.

[0230] See appendix Figure 13 In this embodiment of the invention, the cross-sectional shape of the air-cooled nozzle 340 is rectangular, and there are multiple air-cooled nozzles 340 that are spaced apart along a first direction.

[0231] See appendix Figure 13 In this embodiment of the invention, the cross-sectional shape of the water mist cooling nozzle 330 is circular or elliptical. The water mist cooling nozzle 330 has multiple nozzles and is arranged at intervals along a first direction and a second direction, wherein the second direction is perpendicular to the first direction.

[0232] See appendix Figure 13 In this embodiment of the invention, the air-cooled nozzle 340 and the water mist cooling nozzle 330 are arranged alternately.

[0233] In this embodiment of the invention, the online quenching device further includes a third cooling component, which is located downstream of the second cooling component; the third cooling component includes a connecting plate, which is provided with an air-cooled nozzle for slowly quenching the aluminum profile.

[0234] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for online quenching of aluminum profiles, characterized in that, Includes the following steps: S100, obtains the nose temperature of the aluminum alloy used in the aluminum profile. T b and quenching sensitive temperature range ( T c , T a and critical cooling rate v b ; S200, Perform pre-cooling quenching, including the following steps: S210, Transfer the aluminum profile to the pre-cooling quenching zone and detect the first temperature before quenching. T 1 and the second temperature after pre-cooling and quenching T 2; S220, control the first cooling rate of the pre-cooling quenching zone. v 1. The temperature of the aluminum profile is increased from the first temperature before quenching. T 1. Reduce to the second temperature after pre-cooling and quenching. T 2, and make the second temperature after pre-cooling and quenching T 2 and the upper limit temperature of the quenching sensitive temperature range T a The first temperature difference between Δ T 1. The temperature falls within the first preset temperature threshold A; S300, Perform forced cold quenching, including the following steps: S310, Transfer the aluminum profile to the forced cold quenching zone, and detect the third temperature after the forced cold quenching. T 3; S320, control the second cooling rate of the strong cold quenching zone. v 2 is greater than or equal to the critical cooling rate. v b ; and cause the temperature of the aluminum profile to rise from the second temperature after pre-cooling and quenching. T 2. Reduce to the third temperature after the strong cold quenching. T 3, and the third temperature after the strong cold quenching T 3. Temperature less than or equal to the lower limit of the quenching sensitive temperature range T c ; Step S200 includes: S101, Obtain preset extrusion process parameters and aluminum profile parameters; wherein, the preset extrusion process parameters include the cross-sectional area of ​​the extrusion cylinder and the preset extrusion shaft speed; the aluminum profile parameters include the cross-sectional area of ​​the aluminum profile, the number of die holes in the aluminum profile, and the length of the aluminum profile in the pre-cooling and quenching zone. S102, calculate the linear velocity of the aluminum profile. v 铝 It satisfies the formula: in, s 1 represents the cross-sectional area of ​​the extrusion cylinder; v 挤 Preset extrusion shaft speed; s 2 represents the cross-sectional area of ​​the aluminum profile; n This refers to the number of die holes in the aluminum profile. The steps between S310 and S320 include the following: S311, the theoretical temperature after strong cold quenching is calculated. T out It satisfies the formula: in, T 2 represents the second temperature after pre-cooling and quenching; v b The critical cooling rate; L 2 represents the length of the aluminum profile in the strong cold quenching zone; v 铝 The linear velocity of the aluminum profile; Step S320 includes the following steps: S321, Detecting room temperature T 室温 ; S322, Determine the theoretical temperature after the forced quenching. T out With room temperature T 室温 and the lower limit temperature of the quenching sensitive temperature range T c Size relationship; If the theoretical temperature after the strong cold quenching T out Temperature greater than the lower limit of the quenching sensitive temperature range T c If so, then step S330 is executed, and the first control is entered; If the theoretical temperature after the strong quenching T out greater than room temperature T 室温 And less than or equal to the lower limit temperature of the quenching sensitive temperature range. T c If so, proceed to step S340 and enter the second control. If the theoretical temperature after the strong quenching T out Less than or equal to room temperature T 室温 Then, step S350 is executed, and the third control is entered.

2. The online quenching method for aluminum profiles according to claim 1, characterized in that, The period between steps S210 and S220 includes: S211, calculate the first target cooling rate of the pre-cooling quenching zone. v 目1 It satisfies the formula: in, v 铝 The linear velocity of the aluminum profile; L 1 represents the length of the aluminum profile in the pre-cooling and quenching zone; ΔT 0 is the first temperature before quenching. T 1. Upper limit temperature of the quenching sensitive temperature range T a The first target temperature difference between them.

3. The online quenching method for aluminum profiles according to claim 2, characterized in that, Step S220 includes the following steps: S221, control the first cooling rate of the pre-cooling quenching zone. v 1 at the first target cooling rate v 目1 The aluminum profile is pre-cooled; S222, Determine the second temperature after pre-cooling and quenching. T 2 and the upper limit temperature of the quenching sensitive temperature range T a The first temperature difference between ΔT The relationship between 1 and the first preset temperature threshold A; S223, if the first temperature difference value ΔT If the temperature falls within the first preset temperature threshold A, then the first cooling rate of the pre-cooling quenching zone is controlled. v 1. Maintain the primary target cooling rate. v 目1 Conversely, proceed to step S224. S224, Adjust the first cooling rate v 1. Obtain the adjusted first cooling rate. v 1 ´ .

4. The online quenching method for aluminum profiles according to claim 3, characterized in that, Step S224: Obtain the adjusted first cooling rate. v 1 ´， Satisfying the formula: in, v 目1 The primary target cooling rate; For coefficients; ΔT 1 represents the second temperature after pre-cooling and quenching. T 2. Upper limit temperature of the quenching sensitive temperature range T a The first temperature difference between them.

5. The online quenching method for aluminum profiles according to any one of claims 1-4, characterized in that, The following steps are also included between steps S310 and S320: S312, calculate the second target cooling rate of the intense quenching zone. v 目2 It satisfies the formula: in, T c This is the lower limit temperature of the quenching-sensitive temperature range; v 铝 The linear velocity of the aluminum profile; L 2 represents the length of the aluminum profile in the strong cold quenching zone; ΔT 2 is the second temperature after pre-cooling and quenching. T 2. Lower limit temperature of the quenching sensitive temperature range T c The second target temperature difference between them.

6. The online quenching method for aluminum profiles according to claim 5, characterized in that, Step S330, entering the first control, includes the following steps: S331, control the second cooling rate of the strong quenching zone. v 2 at the second target cooling rate v 目2 The aluminum profile is subjected to intense cooling; S332, Determine the third temperature after the aluminum profile has undergone strong cold quenching. T 3 and the lower limit temperature of the quenching sensitive temperature range T c The third temperature difference between ΔT 3. The relationship between the magnitude of the third preset temperature threshold B; S333, if the third temperature difference value ΔT If the temperature falls within the third preset temperature threshold B, then the second cooling rate of the strong quenching zone is controlled. v 2. Maintain the second target cooling rate. v 目2 Conversely, proceed to step S334. S334, Adjust the second cooling rate v 2. Obtain the third cooling rate v 3. Satisfies the formula: in, v 目2 The second target cooling rate; 1 is a coefficient; ΔT 3 represents the third temperature after the aluminum profile has undergone strong cold quenching. T 3 and the lower limit temperature of the quenching sensitive temperature range T c The third temperature difference between them.

7. The online quenching method for aluminum profiles according to claim 5, characterized in that, Step S340, entering the second control, includes the following steps: S341, Control the second cooling rate of the strong quenching zone. v 2 at the critical cooling rate v b The aluminum profile is subjected to intense cooling; S342, Determine the third temperature after the aluminum profile has undergone strong cold quenching. T 3 and the theoretical temperature after the strong quenching T out The fourth temperature difference between ΔT 4. The relationship between the magnitude of the fourth preset temperature threshold C; S343, if the fourth temperature difference value ΔT If the temperature falls within the fourth preset temperature threshold C, then the second cooling rate of the strong quenching zone is controlled. v 2. Maintain at the critical cooling rate. v b Conversely, proceed to step S344. S344, Adjust the second cooling rate v 2. Obtain the fourth cooling rate v 4. Satisfies the formula: in, v b The critical cooling rate; 2 is the coefficient; ΔT 4 represents the third temperature after the aluminum profile has undergone strong cold quenching. T 3. Theoretical temperature after strong cold quenching T out The fourth temperature difference between them.

8. The online quenching method for aluminum profiles according to claim 5, characterized in that, Step S350, entering the third control, includes the following steps: S351, Detecting inlet water temperature T 入 Actual inflow rate (m) 入 Outlet water temperature T 出 Outflow rate (m) 出 ; S352, based on the law of conservation of energy, calculates the theoretical temperature reached after the intense cold quenching. T out The theoretical water flow rate through the strong cold quenching zone per unit time m 理论 This includes the following steps: S353 calculates the theoretical heat that the aluminum profile needs to release per unit time in the strong cold quenching zone. Q Al It satisfies the formula: S354, the theoretical water flow rate through the strong cold quenching zone per unit time is calculated. m 理论 ， Satisfying the formula: Among them, Q Al The theoretical heat (J / C) that an aluminum profile needs to release per unit time in the strong cold quenching zone. Al C is the specific heat capacity of aluminum profiles. Al =0.88*10 3 J / (kg*℃); m Al The mass (kg) of aluminum profile passing through the strong cooling zone per unit time; Δ T 理论 The second temperature after pre-cooling and quenching T 2. Theoretical temperature after strong cold quenching T out The theoretical temperature difference between them is ℃; s 2 represents the cross-sectional area of ​​the aluminum profile. m 2 ; n This refers to the number of die holes in the aluminum profile. v 铝 Linear velocity of aluminum profile m / s ;ρ Al ρ is the density of the aluminum profile. Al =2.50*10 3 kg / m³-2.88*10 3 Between kg / m³; C 水 C is the specific heat capacity of water. 水 =4.2×10 3 J / (kg*℃); T 入 The inlet water temperature is ℃; m 入 This represents the actual inflow rate. T 出 Outlet water temperature T 出 ; m 出 This refers to the outflow rate; k For compensation coefficient, k= 1.05-1.3; S355, control the strong cold quenching zone to use the theoretical water inlet flow rate. m 理论 The pre-cooled aluminum profile is subjected to intensive cooling.

9. An online quenching system for aluminum profiles, characterized in that, The online quenching method for aluminum profiles according to any one of claims 1-8, wherein the online quenching system comprises: The detection module includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is used to detect the first temperature before quenching. T 1; The second temperature sensor is used to detect the second temperature after pre-cooling and quenching. T 2; The third temperature sensor is used to detect the third temperature after the forced quenching. T 3; The control module is used to control the first cooling rate of the pre-cooling and quenching zone. v 1. The temperature of the aluminum profile is increased from the first temperature before quenching. T 1. Reduce to the second temperature after pre-cooling and quenching. T 2, and make the second temperature after pre-cooling and quenching T 2 and the upper limit temperature of the quenching sensitive temperature range T a The first temperature difference between ΔT 1. Falling to a first preset temperature threshold; and 2. A second cooling rate for controlling the intense quenching zone. v 2 is greater than or equal to the critical cooling rate. v b ; and cause the temperature of the aluminum profile to rise from the second temperature. T 2. Reduce to the third temperature T 3, and the third temperature T 3. Temperature less than or equal to the lower limit of the quenching sensitive temperature range T c .

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